diff --git a/admin/sync/file.go b/admin/sync/file.go
index c9e9c6d4..c9992862 100644
--- a/admin/sync/file.go
+++ b/admin/sync/file.go
@@ -23,6 +23,7 @@ type Importer interface {
 	importFile(URI string, next func(string, string) (interface{}, error)) (interface{}, error)
 	getFile(filename string, writer *bufio.Writer) error
 	listDir(filename string) ([]string, error)
+	stat(filename string) (os.FileInfo, error)
 }
 
 var GlobalImporter Importer
diff --git a/admin/sync/importer_cloud.go b/admin/sync/importer_cloud.go
index f836927c..07b8406f 100644
--- a/admin/sync/importer_cloud.go
+++ b/admin/sync/importer_cloud.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"net/http"
 	"net/url"
+	"os"
 	"path"
 	"strings"
 
@@ -95,3 +96,7 @@ func (i CloudImporter) listDir(filename string) ([]string, error) {
 		return res, nil
 	}
 }
+
+func (i CloudImporter) stat(filename string) (os.FileInfo, error) {
+	return gowebdav.NewClient(i.baseDAV.String(), i.username, i.password).Stat(strings.Replace(url.PathEscape(filename), "%2F", "/", -1))
+}
diff --git a/admin/sync/importer_localfs.go b/admin/sync/importer_localfs.go
index 4317ec72..fe8c6530 100644
--- a/admin/sync/importer_localfs.go
+++ b/admin/sync/importer_localfs.go
@@ -70,3 +70,7 @@ func (i LocalImporter) listDir(filename string) ([]string, error) {
 		return res, nil
 	}
 }
+
+func (i LocalImporter) stat(filename string) (os.FileInfo, error) {
+	return os.Stat(path.Join(i.Base, filename))
+}